Finding the Fourth Proportional to 42,945.60, 64,423.20 and 13,363.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,945.60 : 64,423.20 = 13,363.20 : x
2. Step 2: Convert to fraction form
   42,945.60/64,423.20 = 13,363.20/x
3. Step 3: Cross multiply
   42,945.60x = 64,423.20 × 13,363.20
4. Step 4: Simplify right side
   42,945.60x = 860,900,106.24
5. Step 5: Solve for x
   x = 860,900,106.24/42,945.60
6. Step 6: Final answer
   x = 20,046.29