Finding the Fourth Proportional to 1,354.16, 1,869.72 and 889.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.16 : 1,869.72 = 889.76 : x
2. Step 2: Convert to fraction form
   1,354.16/1,869.72 = 889.76/x
3. Step 3: Cross multiply
   1,354.16x = 1,869.72 × 889.76
4. Step 4: Simplify right side
   1,354.16x = 1,663,602.07
5. Step 5: Solve for x
   x = 1,663,602.07/1,354.16
6. Step 6: Final answer
   x = 1,228.51