Finding the Fourth Proportional to 45,315.85, 67,870.23 and 21,639.98

Step by Step Solution

1. Step 1: Write the proportion equation
   45,315.85 : 67,870.23 = 21,639.98 : x
2. Step 2: Convert to fraction form
   45,315.85/67,870.23 = 21,639.98/x
3. Step 3: Cross multiply
   45,315.85x = 67,870.23 × 21,639.98
4. Step 4: Simplify right side
   45,315.85x = 1,468,710,473.90
5. Step 5: Solve for x
   x = 1,468,710,473.90/45,315.85
6. Step 6: Final answer
   x = 32,410.53