Finding the Fourth Proportional to 12,499.02, 17,252.07 and 7,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.02 : 17,252.07 = 7,780.50 : x
2. Step 2: Convert to fraction form
   12,499.02/17,252.07 = 7,780.50/x
3. Step 3: Cross multiply
   12,499.02x = 17,252.07 × 7,780.50
4. Step 4: Simplify right side
   12,499.02x = 134,229,730.64
5. Step 5: Solve for x
   x = 134,229,730.64/12,499.02
6. Step 6: Final answer
   x = 10,739.22