Finding the Fourth Proportional to 99,498.36, 137,300.76 and 56,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,498.36 : 137,300.76 = 56,478.72 : x
2. Step 2: Convert to fraction form
   99,498.36/137,300.76 = 56,478.72/x
3. Step 3: Cross multiply
   99,498.36x = 137,300.76 × 56,478.72
4. Step 4: Simplify right side
   99,498.36x = 7,754,571,179.83
5. Step 5: Solve for x
   x = 7,754,571,179.83/99,498.36
6. Step 6: Final answer
   x = 77,936.67