Finding the Fourth Proportional to 1,385.10, 2,076.57 and 891.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.10 : 2,076.57 = 891.81 : x
2. Step 2: Convert to fraction form
   1,385.10/2,076.57 = 891.81/x
3. Step 3: Cross multiply
   1,385.10x = 2,076.57 × 891.81
4. Step 4: Simplify right side
   1,385.10x = 1,851,905.89
5. Step 5: Solve for x
   x = 1,851,905.89/1,385.10
6. Step 6: Final answer
   x = 1,337.02