Finding the Fourth Proportional to 99,312.88, 137,013 and 56,848.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,312.88 : 137,013 = 56,848.72 : x
2. Step 2: Convert to fraction form
   99,312.88/137,013 = 56,848.72/x
3. Step 3: Cross multiply
   99,312.88x = 137,013 × 56,848.72
4. Step 4: Simplify right side
   99,312.88x = 7,789,013,673.36
5. Step 5: Solve for x
   x = 7,789,013,673.36/99,312.88
6. Step 6: Final answer
   x = 78,429.04