Finding the Fourth Proportional to 42,479.28, 63,632.52 and 21,406.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,479.28 : 63,632.52 = 21,406.32 : x
2. Step 2: Convert to fraction form
   42,479.28/63,632.52 = 21,406.32/x
3. Step 3: Cross multiply
   42,479.28x = 63,632.52 × 21,406.32
4. Step 4: Simplify right side
   42,479.28x = 1,362,138,085.53
5. Step 5: Solve for x
   x = 1,362,138,085.53/42,479.28
6. Step 6: Final answer
   x = 32,065.94