Finding the Fourth Proportional to 201,870.56, 278,581.68 and 109,989.42

Step by Step Solution

1. Step 1: Write the proportion equation
   201,870.56 : 278,581.68 = 109,989.42 : x
2. Step 2: Convert to fraction form
   201,870.56/278,581.68 = 109,989.42/x
3. Step 3: Cross multiply
   201,870.56x = 278,581.68 × 109,989.42
4. Step 4: Simplify right side
   201,870.56x = 30,641,037,405.83
5. Step 5: Solve for x
   x = 30,641,037,405.83/201,870.56
6. Step 6: Final answer
   x = 151,785.57