Finding the Fourth Proportional to 42,429.60, 63,628.20 and 12,837.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,429.60 : 63,628.20 = 12,837.60 : x
2. Step 2: Convert to fraction form
   42,429.60/63,628.20 = 12,837.60/x
3. Step 3: Cross multiply
   42,429.60x = 63,628.20 × 12,837.60
4. Step 4: Simplify right side
   42,429.60x = 816,833,380.32
5. Step 5: Solve for x
   x = 816,833,380.32/42,429.60
6. Step 6: Final answer
   x = 19,251.50