Finding the Fourth Proportional to 42,998.34, 64,512.63 and 13,423.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,998.34 : 64,512.63 = 13,423.62 : x
2. Step 2: Convert to fraction form
   42,998.34/64,512.63 = 13,423.62/x
3. Step 3: Cross multiply
   42,998.34x = 64,512.63 × 13,423.62
4. Step 4: Simplify right side
   42,998.34x = 865,993,030.32
5. Step 5: Solve for x
   x = 865,993,030.32/42,998.34
6. Step 6: Final answer
   x = 20,140.15