Finding the Fourth Proportional to 99,423.77, 137,210.72 and 56,985.03

Step by Step Solution

1. Step 1: Write the proportion equation
   99,423.77 : 137,210.72 = 56,985.03 : x
2. Step 2: Convert to fraction form
   99,423.77/137,210.72 = 56,985.03/x
3. Step 3: Cross multiply
   99,423.77x = 137,210.72 × 56,985.03
4. Step 4: Simplify right side
   99,423.77x = 7,818,956,710.60
5. Step 5: Solve for x
   x = 7,818,956,710.60/99,423.77
6. Step 6: Final answer
   x = 78,642.73