Finding the Fourth Proportional to 42,377.76, 63,584.58 and 21,306.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,377.76 : 63,584.58 = 21,306.72 : x
2. Step 2: Convert to fraction form
   42,377.76/63,584.58 = 21,306.72/x
3. Step 3: Cross multiply
   42,377.76x = 63,584.58 × 21,306.72
4. Step 4: Simplify right side
   42,377.76x = 1,354,778,842.38
5. Step 5: Solve for x
   x = 1,354,778,842.38/42,377.76
6. Step 6: Final answer
   x = 31,969.10