Finding the Fourth Proportional to 76,931.31, 106,167.40 and 42,939.10

Step by Step Solution

1. Step 1: Write the proportion equation
   76,931.31 : 106,167.40 = 42,939.10 : x
2. Step 2: Convert to fraction form
   76,931.31/106,167.40 = 42,939.10/x
3. Step 3: Cross multiply
   76,931.31x = 106,167.40 × 42,939.10
4. Step 4: Simplify right side
   76,931.31x = 4,558,732,356.82
5. Step 5: Solve for x
   x = 4,558,732,356.82/76,931.31
6. Step 6: Final answer
   x = 59,257.18