Finding the Fourth Proportional to 42,288.30, 63,435.42 and 12,706.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,288.30 : 63,435.42 = 12,706.29 : x
2. Step 2: Convert to fraction form
   42,288.30/63,435.42 = 12,706.29/x
3. Step 3: Cross multiply
   42,288.30x = 63,435.42 × 12,706.29
4. Step 4: Simplify right side
   42,288.30x = 806,028,842.79
5. Step 5: Solve for x
   x = 806,028,842.79/42,288.30
6. Step 6: Final answer
   x = 19,060.33