Finding the Fourth Proportional to 21,057.60, 31,592.08 and 7,019.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,057.60 : 31,592.08 = 7,019.86 : x
2. Step 2: Convert to fraction form
   21,057.60/31,592.08 = 7,019.86/x
3. Step 3: Cross multiply
   21,057.60x = 31,592.08 × 7,019.86
4. Step 4: Simplify right side
   21,057.60x = 221,771,978.71
5. Step 5: Solve for x
   x = 221,771,978.71/21,057.60
6. Step 6: Final answer
   x = 10,531.68