Finding the Fourth Proportional to 1,370.40, 1,887.78 and 1,091.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.40 : 1,887.78 = 1,091.58 : x
2. Step 2: Convert to fraction form
   1,370.40/1,887.78 = 1,091.58/x
3. Step 3: Cross multiply
   1,370.40x = 1,887.78 × 1,091.58
4. Step 4: Simplify right side
   1,370.40x = 2,060,662.89
5. Step 5: Solve for x
   x = 2,060,662.89/1,370.40
6. Step 6: Final answer
   x = 1,503.69