Finding the Fourth Proportional to 64,980.12, 89,672.70 and 35,172.12

Step by Step Solution

1. Step 1: Write the proportion equation
   64,980.12 : 89,672.70 = 35,172.12 : x
2. Step 2: Convert to fraction form
   64,980.12/89,672.70 = 35,172.12/x
3. Step 3: Cross multiply
   64,980.12x = 89,672.70 × 35,172.12
4. Step 4: Simplify right side
   64,980.12x = 3,153,978,965.12
5. Step 5: Solve for x
   x = 3,153,978,965.12/64,980.12
6. Step 6: Final answer
   x = 48,537.60