Finding the Fourth Proportional to 42,761.76, 64,119.72 and 21,411.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.76 : 64,119.72 = 21,411.12 : x
2. Step 2: Convert to fraction form
   42,761.76/64,119.72 = 21,411.12/x
3. Step 3: Cross multiply
   42,761.76x = 64,119.72 × 21,411.12
4. Step 4: Simplify right side
   42,761.76x = 1,372,875,019.29
5. Step 5: Solve for x
   x = 1,372,875,019.29/42,761.76
6. Step 6: Final answer
   x = 32,105.20