Finding the Fourth Proportional to 1,816.50, 2,507.40 and 1,117.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,816.50 : 2,507.40 = 1,117.89 : x
2. Step 2: Convert to fraction form
   1,816.50/2,507.40 = 1,117.89/x
3. Step 3: Cross multiply
   1,816.50x = 2,507.40 × 1,117.89
4. Step 4: Simplify right side
   1,816.50x = 2,802,997.39
5. Step 5: Solve for x
   x = 2,802,997.39/1,816.50
6. Step 6: Final answer
   x = 1,543.08