Finding the Fourth Proportional to 1,318.56, 1,978.51 and 972.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,318.56 : 1,978.51 = 972.48 : x
2. Step 2: Convert to fraction form
   1,318.56/1,978.51 = 972.48/x
3. Step 3: Cross multiply
   1,318.56x = 1,978.51 × 972.48
4. Step 4: Simplify right side
   1,318.56x = 1,924,061.40
5. Step 5: Solve for x
   x = 1,924,061.40/1,318.56
6. Step 6: Final answer
   x = 1,459.21