Finding the Fourth Proportional to 42,680.96, 64,019.01 and 13,098.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,680.96 : 64,019.01 = 13,098.75 : x
2. Step 2: Convert to fraction form
   42,680.96/64,019.01 = 13,098.75/x
3. Step 3: Cross multiply
   42,680.96x = 64,019.01 × 13,098.75
4. Step 4: Simplify right side
   42,680.96x = 838,569,007.24
5. Step 5: Solve for x
   x = 838,569,007.24/42,680.96
6. Step 6: Final answer
   x = 19,647.38