Finding the Fourth Proportional to 103,134.88, 142,320.72 and 58,420

Step by Step Solution

1. Step 1: Write the proportion equation
   103,134.88 : 142,320.72 = 58,420 : x
2. Step 2: Convert to fraction form
   103,134.88/142,320.72 = 58,420/x
3. Step 3: Cross multiply
   103,134.88x = 142,320.72 × 58,420
4. Step 4: Simplify right side
   103,134.88x = 8,314,376,462.40
5. Step 5: Solve for x
   x = 8,314,376,462.40/103,134.88
6. Step 6: Final answer
   x = 80,616.53