Finding the Fourth Proportional to 42,679.46, 64,016.76 and 13,097.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42,679.46 : 64,016.76 = 13,097.24 : x
2. Step 2: Convert to fraction form
   42,679.46/64,016.76 = 13,097.24/x
3. Step 3: Cross multiply
   42,679.46x = 64,016.76 × 13,097.24
4. Step 4: Simplify right side
   42,679.46x = 838,443,088.42
5. Step 5: Solve for x
   x = 838,443,088.42/42,679.46
6. Step 6: Final answer
   x = 19,645.12