Finding the Fourth Proportional to 99,400.10, 137,175.91 and 56,966.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,400.10 : 137,175.91 = 56,966.83 : x
2. Step 2: Convert to fraction form
   99,400.10/137,175.91 = 56,966.83/x
3. Step 3: Cross multiply
   99,400.10x = 137,175.91 × 56,966.83
4. Step 4: Simplify right side
   99,400.10x = 7,814,476,259.71
5. Step 5: Solve for x
   x = 7,814,476,259.71/99,400.10
6. Step 6: Final answer
   x = 78,616.39