Finding the Fourth Proportional to 42,081.63, 63,111.60 and 12,492.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,081.63 : 63,111.60 = 12,492.78 : x
2. Step 2: Convert to fraction form
   42,081.63/63,111.60 = 12,492.78/x
3. Step 3: Cross multiply
   42,081.63x = 63,111.60 × 12,492.78
4. Step 4: Simplify right side
   42,081.63x = 788,439,334.25
5. Step 5: Solve for x
   x = 788,439,334.25/42,081.63
6. Step 6: Final answer
   x = 18,735.95