Finding the Fourth Proportional to 1,398.06, 1,928.75 and 900.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.06 : 1,928.75 = 900.63 : x
2. Step 2: Convert to fraction form
   1,398.06/1,928.75 = 900.63/x
3. Step 3: Cross multiply
   1,398.06x = 1,928.75 × 900.63
4. Step 4: Simplify right side
   1,398.06x = 1,737,085.61
5. Step 5: Solve for x
   x = 1,737,085.61/1,398.06
6. Step 6: Final answer
   x = 1,242.50