Finding the Fourth Proportional to 8,957.16, 12,360.52 and 4,978.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,957.16 : 12,360.52 = 4,978.34 : x
2. Step 2: Convert to fraction form
   8,957.16/12,360.52 = 4,978.34/x
3. Step 3: Cross multiply
   8,957.16x = 12,360.52 × 4,978.34
4. Step 4: Simplify right side
   8,957.16x = 61,534,871.14
5. Step 5: Solve for x
   x = 61,534,871.14/8,957.16
6. Step 6: Final answer
   x = 6,869.91