Finding the Fourth Proportional to 1,345.76, 1,854.42 and 972.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.76 : 1,854.42 = 972.08 : x
2. Step 2: Convert to fraction form
   1,345.76/1,854.42 = 972.08/x
3. Step 3: Cross multiply
   1,345.76x = 1,854.42 × 972.08
4. Step 4: Simplify right side
   1,345.76x = 1,802,644.59
5. Step 5: Solve for x
   x = 1,802,644.59/1,345.76
6. Step 6: Final answer
   x = 1,339.50