Finding the Fourth Proportional to 42,087.63, 63,120.60 and 12,498.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,087.63 : 63,120.60 = 12,498.78 : x
2. Step 2: Convert to fraction form
   42,087.63/63,120.60 = 12,498.78/x
3. Step 3: Cross multiply
   42,087.63x = 63,120.60 × 12,498.78
4. Step 4: Simplify right side
   42,087.63x = 788,930,492.87
5. Step 5: Solve for x
   x = 788,930,492.87/42,087.63
6. Step 6: Final answer
   x = 18,744.95