Finding the Fourth Proportional to 12,987.52, 17,925.76 and 7,612.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.52 : 17,925.76 = 7,612.40 : x
2. Step 2: Convert to fraction form
   12,987.52/17,925.76 = 7,612.40/x
3. Step 3: Cross multiply
   12,987.52x = 17,925.76 × 7,612.40
4. Step 4: Simplify right side
   12,987.52x = 136,458,055.42
5. Step 5: Solve for x
   x = 136,458,055.42/12,987.52
6. Step 6: Final answer
   x = 10,506.86