Finding the Fourth Proportional to 1,865.32, 2,798.59 and 891.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,865.32 : 2,798.59 = 891.50 : x
2. Step 2: Convert to fraction form
   1,865.32/2,798.59 = 891.50/x
3. Step 3: Cross multiply
   1,865.32x = 2,798.59 × 891.50
4. Step 4: Simplify right side
   1,865.32x = 2,494,945.21
5. Step 5: Solve for x
   x = 2,494,945.21/1,865.32
6. Step 6: Final answer
   x = 1,337.54