Finding the Fourth Proportional to 42,460.76, 63,700.32 and 12,880.85

Step by Step Solution

1. Step 1: Write the proportion equation
   42,460.76 : 63,700.32 = 12,880.85 : x
2. Step 2: Convert to fraction form
   42,460.76/63,700.32 = 12,880.85/x
3. Step 3: Cross multiply
   42,460.76x = 63,700.32 × 12,880.85
4. Step 4: Simplify right side
   42,460.76x = 820,514,266.87
5. Step 5: Solve for x
   x = 820,514,266.87/42,460.76
6. Step 6: Final answer
   x = 19,324.06