Finding the Fourth Proportional to 99,401.58, 137,142.72 and 56,373.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,401.58 : 137,142.72 = 56,373.57 : x
2. Step 2: Convert to fraction form
   99,401.58/137,142.72 = 56,373.57/x
3. Step 3: Cross multiply
   99,401.58x = 137,142.72 × 56,373.57
4. Step 4: Simplify right side
   99,401.58x = 7,731,224,725.91
5. Step 5: Solve for x
   x = 7,731,224,725.91/99,401.58
6. Step 6: Final answer
   x = 77,777.68