Finding the Fourth Proportional to 45,689.86, 68,345.25 and 42,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   45,689.86 : 68,345.25 = 42,890.50 : x
2. Step 2: Convert to fraction form
   45,689.86/68,345.25 = 42,890.50/x
3. Step 3: Cross multiply
   45,689.86x = 68,345.25 × 42,890.50
4. Step 4: Simplify right side
   45,689.86x = 2,931,361,945.13
5. Step 5: Solve for x
   x = 2,931,361,945.13/45,689.86
6. Step 6: Final answer
   x = 64,157.82