Finding the Fourth Proportional to 256,910,061.57, 354,536,235.08 and 139,435,393.33

Step by Step Solution

1. Step 1: Write the proportion equation
   256,910,061.57 : 354,536,235.08 = 139,435,393.33 : x
2. Step 2: Convert to fraction form
   256,910,061.57/354,536,235.08 = 139,435,393.33/x
3. Step 3: Cross multiply
   256,910,061.57x = 354,536,235.08 × 139,435,393.33
4. Step 4: Simplify right side
   256,910,061.57x = 49,434,899,388,117,144
5. Step 5: Solve for x
   x = 49,434,899,388,117,144/256,910,061.57
6. Step 6: Final answer
   x = 192,421,032.82