Finding the Fourth Proportional to 42,432.30, 63,640.35 and 12,851.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,432.30 : 63,640.35 = 12,851.10 : x
2. Step 2: Convert to fraction form
   42,432.30/63,640.35 = 12,851.10/x
3. Step 3: Cross multiply
   42,432.30x = 63,640.35 × 12,851.10
4. Step 4: Simplify right side
   42,432.30x = 817,848,501.89
5. Step 5: Solve for x
   x = 817,848,501.89/42,432.30
6. Step 6: Final answer
   x = 19,274.20