Finding the Fourth Proportional to 12,991.52, 17,925.12 and 7,684.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991.52 : 17,925.12 = 7,684.16 : x
2. Step 2: Convert to fraction form
   12,991.52/17,925.12 = 7,684.16/x
3. Step 3: Cross multiply
   12,991.52x = 17,925.12 × 7,684.16
4. Step 4: Simplify right side
   12,991.52x = 137,739,490.10
5. Step 5: Solve for x
   x = 137,739,490.10/12,991.52
6. Step 6: Final answer
   x = 10,602.26