Finding the Fourth Proportional to 42,061.60, 63,091.95 and 12,479.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,061.60 : 63,091.95 = 12,479.73 : x
2. Step 2: Convert to fraction form
   42,061.60/63,091.95 = 12,479.73/x
3. Step 3: Cross multiply
   42,061.60x = 63,091.95 × 12,479.73
4. Step 4: Simplify right side
   42,061.60x = 787,370,501.17
5. Step 5: Solve for x
   x = 787,370,501.17/42,061.60
6. Step 6: Final answer
   x = 18,719.46