Finding the Fourth Proportional to 58,938.88, 81,223.68 and 42,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   58,938.88 : 81,223.68 = 42,142.72 : x
2. Step 2: Convert to fraction form
   58,938.88/81,223.68 = 42,142.72/x
3. Step 3: Cross multiply
   58,938.88x = 81,223.68 × 42,142.72
4. Step 4: Simplify right side
   58,938.88x = 3,422,986,803.61
5. Step 5: Solve for x
   x = 3,422,986,803.61/58,938.88
6. Step 6: Final answer
   x = 58,076.89