Finding the Fourth Proportional to 123,858.51, 170,928.78 and 70,142.37

Step by Step Solution

1. Step 1: Write the proportion equation
   123,858.51 : 170,928.78 = 70,142.37 : x
2. Step 2: Convert to fraction form
   123,858.51/170,928.78 = 70,142.37/x
3. Step 3: Cross multiply
   123,858.51x = 170,928.78 × 70,142.37
4. Step 4: Simplify right side
   123,858.51x = 11,989,349,730.41
5. Step 5: Solve for x
   x = 11,989,349,730.41/123,858.51
6. Step 6: Final answer
   x = 96,798.76