Finding the Fourth Proportional to 99,773.31, 137,690.38 and 56,751.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,773.31 : 137,690.38 = 56,751.69 : x
2. Step 2: Convert to fraction form
   99,773.31/137,690.38 = 56,751.69/x
3. Step 3: Cross multiply
   99,773.31x = 137,690.38 × 56,751.69
4. Step 4: Simplify right side
   99,773.31x = 7,814,161,574.51
5. Step 5: Solve for x
   x = 7,814,161,574.51/99,773.31
6. Step 6: Final answer
   x = 78,319.16