Finding the Fourth Proportional to 142,578.72, 213,876.72 and 83,368.80

Step by Step Solution

1. Step 1: Write the proportion equation
   142,578.72 : 213,876.72 = 83,368.80 : x
2. Step 2: Convert to fraction form
   142,578.72/213,876.72 = 83,368.80/x
3. Step 3: Cross multiply
   142,578.72x = 213,876.72 × 83,368.80
4. Step 4: Simplify right side
   142,578.72x = 17,830,645,494.34
5. Step 5: Solve for x
   x = 17,830,645,494.34/142,578.72
6. Step 6: Final answer
   x = 125,058.25