Finding the Fourth Proportional to 123,211.71, 170,058.69 and 77,860.89

Step by Step Solution

1. Step 1: Write the proportion equation
   123,211.71 : 170,058.69 = 77,860.89 : x
2. Step 2: Convert to fraction form
   123,211.71/170,058.69 = 77,860.89/x
3. Step 3: Cross multiply
   123,211.71x = 170,058.69 × 77,860.89
4. Step 4: Simplify right side
   123,211.71x = 13,240,920,955.63
5. Step 5: Solve for x
   x = 13,240,920,955.63/123,211.71
6. Step 6: Final answer
   x = 107,464.79