Finding the Fourth Proportional to 1,343.12, 1,853.30 and 783.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.12 : 1,853.30 = 783.50 : x
2. Step 2: Convert to fraction form
   1,343.12/1,853.30 = 783.50/x
3. Step 3: Cross multiply
   1,343.12x = 1,853.30 × 783.50
4. Step 4: Simplify right side
   1,343.12x = 1,452,060.55
5. Step 5: Solve for x
   x = 1,452,060.55/1,343.12
6. Step 6: Final answer
   x = 1,081.11