Finding the Fourth Proportional to 64,647.32, 89,191.86 and 52,690.12

Step by Step Solution

1. Step 1: Write the proportion equation
   64,647.32 : 89,191.86 = 52,690.12 : x
2. Step 2: Convert to fraction form
   64,647.32/89,191.86 = 52,690.12/x
3. Step 3: Cross multiply
   64,647.32x = 89,191.86 × 52,690.12
4. Step 4: Simplify right side
   64,647.32x = 4,699,529,806.42
5. Step 5: Solve for x
   x = 4,699,529,806.42/64,647.32
6. Step 6: Final answer
   x = 72,694.89