Finding the Fourth Proportional to 64,796.70, 89,436.12 and 42,192.12

Step by Step Solution

1. Step 1: Write the proportion equation
   64,796.70 : 89,436.12 = 42,192.12 : x
2. Step 2: Convert to fraction form
   64,796.70/89,436.12 = 42,192.12/x
3. Step 3: Cross multiply
   64,796.70x = 89,436.12 × 42,192.12
4. Step 4: Simplify right side
   64,796.70x = 3,773,499,507.37
5. Step 5: Solve for x
   x = 3,773,499,507.37/64,796.70
6. Step 6: Final answer
   x = 58,235.98