Finding the Fourth Proportional to 99,667.18, 137,535.96 and 56,645.54

Step by Step Solution

1. Step 1: Write the proportion equation
   99,667.18 : 137,535.96 = 56,645.54 : x
2. Step 2: Convert to fraction form
   99,667.18/137,535.96 = 56,645.54/x
3. Step 3: Cross multiply
   99,667.18x = 137,535.96 × 56,645.54
4. Step 4: Simplify right side
   99,667.18x = 7,790,798,723.62
5. Step 5: Solve for x
   x = 7,790,798,723.62/99,667.18
6. Step 6: Final answer
   x = 78,168.15