Finding the Fourth Proportional to 9,129.17, 12,605.93 and 5,777.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,129.17 : 12,605.93 = 5,777.89 : x
2. Step 2: Convert to fraction form
   9,129.17/12,605.93 = 5,777.89/x
3. Step 3: Cross multiply
   9,129.17x = 12,605.93 × 5,777.89
4. Step 4: Simplify right side
   9,129.17x = 72,835,685.42
5. Step 5: Solve for x
   x = 72,835,685.42/9,129.17
6. Step 6: Final answer
   x = 7,978.35