Finding the Fourth Proportional to 99,128.72, 136,804.40 and 56,108.27

Step by Step Solution

1. Step 1: Write the proportion equation
   99,128.72 : 136,804.40 = 56,108.27 : x
2. Step 2: Convert to fraction form
   99,128.72/136,804.40 = 56,108.27/x
3. Step 3: Cross multiply
   99,128.72x = 136,804.40 × 56,108.27
4. Step 4: Simplify right side
   99,128.72x = 7,675,857,247.82
5. Step 5: Solve for x
   x = 7,675,857,247.82/99,128.72
6. Step 6: Final answer
   x = 77,433.24