Finding the Fourth Proportional to 1,385.48, 1,911.54 and 970.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.48 : 1,911.54 = 970.76 : x
2. Step 2: Convert to fraction form
   1,385.48/1,911.54 = 970.76/x
3. Step 3: Cross multiply
   1,385.48x = 1,911.54 × 970.76
4. Step 4: Simplify right side
   1,385.48x = 1,855,646.57
5. Step 5: Solve for x
   x = 1,855,646.57/1,385.48
6. Step 6: Final answer
   x = 1,339.35