Finding the Fourth Proportional to 64,945.80, 89,642.16 and 42,340.86

Step by Step Solution

1. Step 1: Write the proportion equation
   64,945.80 : 89,642.16 = 42,340.86 : x
2. Step 2: Convert to fraction form
   64,945.80/89,642.16 = 42,340.86/x
3. Step 3: Cross multiply
   64,945.80x = 89,642.16 × 42,340.86
4. Step 4: Simplify right side
   64,945.80x = 3,795,526,146.66
5. Step 5: Solve for x
   x = 3,795,526,146.66/64,945.80
6. Step 6: Final answer
   x = 58,441.44