Finding the Fourth Proportional to 1,379.10, 1,902.30 and 907.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.10 : 1,902.30 = 907.02 : x
2. Step 2: Convert to fraction form
   1,379.10/1,902.30 = 907.02/x
3. Step 3: Cross multiply
   1,379.10x = 1,902.30 × 907.02
4. Step 4: Simplify right side
   1,379.10x = 1,725,424.15
5. Step 5: Solve for x
   x = 1,725,424.15/1,379.10
6. Step 6: Final answer
   x = 1,251.12