Finding the Fourth Proportional to 1,547.69, 2,319.20 and 930.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,547.69 : 2,319.20 = 930.72 : x
2. Step 2: Convert to fraction form
   1,547.69/2,319.20 = 930.72/x
3. Step 3: Cross multiply
   1,547.69x = 2,319.20 × 930.72
4. Step 4: Simplify right side
   1,547.69x = 2,158,525.82
5. Step 5: Solve for x
   x = 2,158,525.82/1,547.69
6. Step 6: Final answer
   x = 1,394.68