Finding the Fourth Proportional to 1,355.99, 1,868.76 and 907.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.99 : 1,868.76 = 907.07 : x
2. Step 2: Convert to fraction form
   1,355.99/1,868.76 = 907.07/x
3. Step 3: Cross multiply
   1,355.99x = 1,868.76 × 907.07
4. Step 4: Simplify right side
   1,355.99x = 1,695,086.79
5. Step 5: Solve for x
   x = 1,695,086.79/1,355.99
6. Step 6: Final answer
   x = 1,250.08