Finding the Fourth Proportional to 64,881.72, 89,480.84 and 42,212.43

Step by Step Solution

1. Step 1: Write the proportion equation
   64,881.72 : 89,480.84 = 42,212.43 : x
2. Step 2: Convert to fraction form
   64,881.72/89,480.84 = 42,212.43/x
3. Step 3: Cross multiply
   64,881.72x = 89,480.84 × 42,212.43
4. Step 4: Simplify right side
   64,881.72x = 3,777,203,483.78
5. Step 5: Solve for x
   x = 3,777,203,483.78/64,881.72
6. Step 6: Final answer
   x = 58,216.76