Finding the Fourth Proportional to 64,929.68, 89,649.96 and 42,638.48

Step by Step Solution

1. Step 1: Write the proportion equation
   64,929.68 : 89,649.96 = 42,638.48 : x
2. Step 2: Convert to fraction form
   64,929.68/89,649.96 = 42,638.48/x
3. Step 3: Cross multiply
   64,929.68x = 89,649.96 × 42,638.48
4. Step 4: Simplify right side
   64,929.68x = 3,822,538,026.46
5. Step 5: Solve for x
   x = 3,822,538,026.46/64,929.68
6. Step 6: Final answer
   x = 58,871.97