Finding the Fourth Proportional to 1,536.60, 2,122.72 and 1,223.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,536.60 : 2,122.72 = 1,223.94 : x
2. Step 2: Convert to fraction form
   1,536.60/2,122.72 = 1,223.94/x
3. Step 3: Cross multiply
   1,536.60x = 2,122.72 × 1,223.94
4. Step 4: Simplify right side
   1,536.60x = 2,598,081.92
5. Step 5: Solve for x
   x = 2,598,081.92/1,536.60
6. Step 6: Final answer
   x = 1,690.80