Finding the Fourth Proportional to 1,288.76, 1,930.86 and 740.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.76 : 1,930.86 = 740.12 : x
2. Step 2: Convert to fraction form
   1,288.76/1,930.86 = 740.12/x
3. Step 3: Cross multiply
   1,288.76x = 1,930.86 × 740.12
4. Step 4: Simplify right side
   1,288.76x = 1,429,068.10
5. Step 5: Solve for x
   x = 1,429,068.10/1,288.76
6. Step 6: Final answer
   x = 1,108.87