Finding the Fourth Proportional to 187,978.56, 259,428.78 and 107,412.54

Step by Step Solution

1. Step 1: Write the proportion equation
   187,978.56 : 259,428.78 = 107,412.54 : x
2. Step 2: Convert to fraction form
   187,978.56/259,428.78 = 107,412.54/x
3. Step 3: Cross multiply
   187,978.56x = 259,428.78 × 107,412.54
4. Step 4: Simplify right side
   187,978.56x = 27,865,904,208.90
5. Step 5: Solve for x
   x = 27,865,904,208.90/187,978.56
6. Step 6: Final answer
   x = 148,239.80