Finding the Fourth Proportional to 138,443.81, 207,696.18 and 42,381.78

Step by Step Solution

1. Step 1: Write the proportion equation
   138,443.81 : 207,696.18 = 42,381.78 : x
2. Step 2: Convert to fraction form
   138,443.81/207,696.18 = 42,381.78/x
3. Step 3: Cross multiply
   138,443.81x = 207,696.18 × 42,381.78
4. Step 4: Simplify right side
   138,443.81x = 8,802,533,807.60
5. Step 5: Solve for x
   x = 8,802,533,807.60/138,443.81
6. Step 6: Final answer
   x = 63,582.00