Finding the Fourth Proportional to 972.56, 1,342.50 and 947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   972.56 : 1,342.50 = 947.72 : x
2. Step 2: Convert to fraction form
   972.56/1,342.50 = 947.72/x
3. Step 3: Cross multiply
   972.56x = 1,342.50 × 947.72
4. Step 4: Simplify right side
   972.56x = 1,272,314.10
5. Step 5: Solve for x
   x = 1,272,314.10/972.56
6. Step 6: Final answer
   x = 1,308.21