Finding the Fourth Proportional to 256,871,662.62, 354,483,123.03 and 139,396,993.18

Step by Step Solution

1. Step 1: Write the proportion equation
   256,871,662.62 : 354,483,123.03 = 139,396,993.18 : x
2. Step 2: Convert to fraction form
   256,871,662.62/354,483,123.03 = 139,396,993.18/x
3. Step 3: Cross multiply
   256,871,662.62x = 354,483,123.03 × 139,396,993.18
4. Step 4: Simplify right side
   256,871,662.62x = 49,413,881,483,438,008
5. Step 5: Solve for x
   x = 49,413,881,483,438,008/256,871,662.62
6. Step 6: Final answer
   x = 192,367,974.65