Finding the Fourth Proportional to 11,978.57, 17,971.32 and 4,957.29

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.57 : 17,971.32 = 4,957.29 : x
2. Step 2: Convert to fraction form
   11,978.57/17,971.32 = 4,957.29/x
3. Step 3: Cross multiply
   11,978.57x = 17,971.32 × 4,957.29
4. Step 4: Simplify right side
   11,978.57x = 89,088,977.53
5. Step 5: Solve for x
   x = 89,088,977.53/11,978.57
6. Step 6: Final answer
   x = 7,437.36