Finding the Fourth Proportional to 2,123.62, 3,188.06 and 1,199.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.62 : 3,188.06 = 1,199.91 : x
2. Step 2: Convert to fraction form
   2,123.62/3,188.06 = 1,199.91/x
3. Step 3: Cross multiply
   2,123.62x = 3,188.06 × 1,199.91
4. Step 4: Simplify right side
   2,123.62x = 3,825,395.53
5. Step 5: Solve for x
   x = 3,825,395.53/2,123.62
6. Step 6: Final answer
   x = 1,801.36