Finding the Fourth Proportional to 1,498.78, 2,068.56 and 909.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,498.78 : 2,068.56 = 909.40 : x
2. Step 2: Convert to fraction form
   1,498.78/2,068.56 = 909.40/x
3. Step 3: Cross multiply
   1,498.78x = 2,068.56 × 909.40
4. Step 4: Simplify right side
   1,498.78x = 1,881,148.46
5. Step 5: Solve for x
   x = 1,881,148.46/1,498.78
6. Step 6: Final answer
   x = 1,255.12