Finding the Fourth Proportional to 1,385.50, 1,911.88 and 755.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.50 : 1,911.88 = 755.99 : x
2. Step 2: Convert to fraction form
   1,385.50/1,911.88 = 755.99/x
3. Step 3: Cross multiply
   1,385.50x = 1,911.88 × 755.99
4. Step 4: Simplify right side
   1,385.50x = 1,445,350.71
5. Step 5: Solve for x
   x = 1,445,350.71/1,385.50
6. Step 6: Final answer
   x = 1,043.20