Finding the Fourth Proportional to 1,300.86, 1,948.05 and 812.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.86 : 1,948.05 = 812.43 : x
2. Step 2: Convert to fraction form
   1,300.86/1,948.05 = 812.43/x
3. Step 3: Cross multiply
   1,300.86x = 1,948.05 × 812.43
4. Step 4: Simplify right side
   1,300.86x = 1,582,654.26
5. Step 5: Solve for x
   x = 1,582,654.26/1,300.86
6. Step 6: Final answer
   x = 1,216.62