Finding the Fourth Proportional to 35,772.59, 53,658.86 and 12,399

Step by Step Solution

1. Step 1: Write the proportion equation
   35,772.59 : 53,658.86 = 12,399 : x
2. Step 2: Convert to fraction form
   35,772.59/53,658.86 = 12,399/x
3. Step 3: Cross multiply
   35,772.59x = 53,658.86 × 12,399
4. Step 4: Simplify right side
   35,772.59x = 665,316,143.15
5. Step 5: Solve for x
   x = 665,316,143.15/35,772.59
6. Step 6: Final answer
   x = 18,598.49