Finding the Fourth Proportional to 25,139.18, 37,651.37 and 12,000.78

Step by Step Solution

1. Step 1: Write the proportion equation
   25,139.18 : 37,651.37 = 12,000.78 : x
2. Step 2: Convert to fraction form
   25,139.18/37,651.37 = 12,000.78/x
3. Step 3: Cross multiply
   25,139.18x = 37,651.37 × 12,000.78
4. Step 4: Simplify right side
   25,139.18x = 451,845,748.06
5. Step 5: Solve for x
   x = 451,845,748.06/25,139.18
6. Step 6: Final answer
   x = 17,973.76