Finding the Fourth Proportional to 1,243.60, 1,861.34 and 914.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.60 : 1,861.34 = 914.45 : x
2. Step 2: Convert to fraction form
   1,243.60/1,861.34 = 914.45/x
3. Step 3: Cross multiply
   1,243.60x = 1,861.34 × 914.45
4. Step 4: Simplify right side
   1,243.60x = 1,702,098.89
5. Step 5: Solve for x
   x = 1,702,098.89/1,243.60
6. Step 6: Final answer
   x = 1,368.69