Finding the Fourth Proportional to 91,100.61, 136,607.17 and 51,647.13

Step by Step Solution

1. Step 1: Write the proportion equation
   91,100.61 : 136,607.17 = 51,647.13 : x
2. Step 2: Convert to fraction form
   91,100.61/136,607.17 = 51,647.13/x
3. Step 3: Cross multiply
   91,100.61x = 136,607.17 × 51,647.13
4. Step 4: Simplify right side
   91,100.61x = 7,055,368,267.92
5. Step 5: Solve for x
   x = 7,055,368,267.92/91,100.61
6. Step 6: Final answer
   x = 77,445.89