Finding the Fourth Proportional to 201,718.78, 278,360.89 and 111,057.53

Step by Step Solution

1. Step 1: Write the proportion equation
   201,718.78 : 278,360.89 = 111,057.53 : x
2. Step 2: Convert to fraction form
   201,718.78/278,360.89 = 111,057.53/x
3. Step 3: Cross multiply
   201,718.78x = 278,360.89 × 111,057.53
4. Step 4: Simplify right side
   201,718.78x = 30,914,071,639.02
5. Step 5: Solve for x
   x = 30,914,071,639.02/201,718.78
6. Step 6: Final answer
   x = 153,253.32