Finding the Fourth Proportional to 1,515.15, 2,091.89 and 1,357.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.15 : 2,091.89 = 1,357.50 : x
2. Step 2: Convert to fraction form
   1,515.15/2,091.89 = 1,357.50/x
3. Step 3: Cross multiply
   1,515.15x = 2,091.89 × 1,357.50
4. Step 4: Simplify right side
   1,515.15x = 2,839,746.82
5. Step 5: Solve for x
   x = 2,839,746.82/1,515.15
6. Step 6: Final answer
   x = 1,874.23