Finding the Fourth Proportional to 1,117.52, 1,539.72 and 976.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117.52 : 1,539.72 = 976.56 : x
2. Step 2: Convert to fraction form
   1,117.52/1,539.72 = 976.56/x
3. Step 3: Cross multiply
   1,117.52x = 1,539.72 × 976.56
4. Step 4: Simplify right side
   1,117.52x = 1,503,628.96
5. Step 5: Solve for x
   x = 1,503,628.96/1,117.52
6. Step 6: Final answer
   x = 1,345.51