Finding the Fourth Proportional to 99,127.50, 136,778.31 and 56,106.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,127.50 : 136,778.31 = 56,106.78 : x
2. Step 2: Convert to fraction form
   99,127.50/136,778.31 = 56,106.78/x
3. Step 3: Cross multiply
   99,127.50x = 136,778.31 × 56,106.78
4. Step 4: Simplify right side
   99,127.50x = 7,674,190,547.94
5. Step 5: Solve for x
   x = 7,674,190,547.94/99,127.50
6. Step 6: Final answer
   x = 77,417.37