Finding the Fourth Proportional to 31,150.08, 42,975.36 and 19,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,150.08 : 42,975.36 = 19,978.56 : x
2. Step 2: Convert to fraction form
   31,150.08/42,975.36 = 19,978.56/x
3. Step 3: Cross multiply
   31,150.08x = 42,975.36 × 19,978.56
4. Step 4: Simplify right side
   31,150.08x = 858,585,808.28
5. Step 5: Solve for x
   x = 858,585,808.28/31,150.08
6. Step 6: Final answer
   x = 27,562.88