Finding the Fourth Proportional to 42,456.00, 63,693.20 and 12,876.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.00 : 63,693.20 = 12,876.10 : x
2. Step 2: Convert to fraction form
   42,456.00/63,693.20 = 12,876.10/x
3. Step 3: Cross multiply
   42,456.00x = 63,693.20 × 12,876.10
4. Step 4: Simplify right side
   42,456.00x = 820,119,948.14
5. Step 5: Solve for x
   x = 820,119,948.14/42,456.00
6. Step 6: Final answer
   x = 19,316.94