Finding the Fourth Proportional to 1,815.51, 2,501.89 and 1,225.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.51 : 2,501.89 = 1,225.02 : x
2. Step 2: Convert to fraction form
   1,815.51/2,501.89 = 1,225.02/x
3. Step 3: Cross multiply
   1,815.51x = 2,501.89 × 1,225.02
4. Step 4: Simplify right side
   1,815.51x = 3,064,865.29
5. Step 5: Solve for x
   x = 3,064,865.29/1,815.51
6. Step 6: Final answer
   x = 1,688.16