Finding the Fourth Proportional to 8,707.94, 12,017.20 and 5,123.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,707.94 : 12,017.20 = 5,123.15 : x
2. Step 2: Convert to fraction form
   8,707.94/12,017.20 = 5,123.15/x
3. Step 3: Cross multiply
   8,707.94x = 12,017.20 × 5,123.15
4. Step 4: Simplify right side
   8,707.94x = 61,565,935.42
5. Step 5: Solve for x
   x = 61,565,935.42/8,707.94
6. Step 6: Final answer
   x = 7,070.09