Finding the Fourth Proportional to 42,620.64, 63,960.12 and 21,858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,620.64 : 63,960.12 = 21,858.72 : x
2. Step 2: Convert to fraction form
   42,620.64/63,960.12 = 21,858.72/x
3. Step 3: Cross multiply
   42,620.64x = 63,960.12 × 21,858.72
4. Step 4: Simplify right side
   42,620.64x = 1,398,086,354.25
5. Step 5: Solve for x
   x = 1,398,086,354.25/42,620.64
6. Step 6: Final answer
   x = 32,803.04