Finding the Fourth Proportional to 42,921, 64,306.44 and 29,781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,921 : 64,306.44 = 29,781.72 : x
2. Step 2: Convert to fraction form
   42,921/64,306.44 = 29,781.72/x
3. Step 3: Cross multiply
   42,921x = 64,306.44 × 29,781.72
4. Step 4: Simplify right side
   42,921x = 1,915,156,390.28
5. Step 5: Solve for x
   x = 1,915,156,390.28/42,921
6. Step 6: Final answer
   x = 44,620.50