Finding the Fourth Proportional to 1,355.65, 1,870.70 and 914.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.65 : 1,870.70 = 914.15 : x
2. Step 2: Convert to fraction form
   1,355.65/1,870.70 = 914.15/x
3. Step 3: Cross multiply
   1,355.65x = 1,870.70 × 914.15
4. Step 4: Simplify right side
   1,355.65x = 1,710,100.41
5. Step 5: Solve for x
   x = 1,710,100.41/1,355.65
6. Step 6: Final answer
   x = 1,261.46