Finding the Fourth Proportional to 42,211.50, 63,339.12 and 21,435

Step by Step Solution

1. Step 1: Write the proportion equation
   42,211.50 : 63,339.12 = 21,435 : x
2. Step 2: Convert to fraction form
   42,211.50/63,339.12 = 21,435/x
3. Step 3: Cross multiply
   42,211.50x = 63,339.12 × 21,435
4. Step 4: Simplify right side
   42,211.50x = 1,357,674,037.20
5. Step 5: Solve for x
   x = 1,357,674,037.20/42,211.50
6. Step 6: Final answer
   x = 32,163.61