Finding the Fourth Proportional to 1,356.72, 1,871.16 and 1,147.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.72 : 1,871.16 = 1,147.40 : x
2. Step 2: Convert to fraction form
   1,356.72/1,871.16 = 1,147.40/x
3. Step 3: Cross multiply
   1,356.72x = 1,871.16 × 1,147.40
4. Step 4: Simplify right side
   1,356.72x = 2,146,968.98
5. Step 5: Solve for x
   x = 2,146,968.98/1,356.72
6. Step 6: Final answer
   x = 1,582.47