Finding the Fourth Proportional to 99,111.60, 136,887.53 and 65,271.34

Step by Step Solution

1. Step 1: Write the proportion equation
   99,111.60 : 136,887.53 = 65,271.34 : x
2. Step 2: Convert to fraction form
   99,111.60/136,887.53 = 65,271.34/x
3. Step 3: Cross multiply
   99,111.60x = 136,887.53 × 65,271.34
4. Step 4: Simplify right side
   99,111.60x = 8,934,832,186.03
5. Step 5: Solve for x
   x = 8,934,832,186.03/99,111.60
6. Step 6: Final answer
   x = 90,149.21