Finding the Fourth Proportional to 236,618.89, 326,531.59 and 129,188.59

Step by Step Solution

1. Step 1: Write the proportion equation
   236,618.89 : 326,531.59 = 129,188.59 : x
2. Step 2: Convert to fraction form
   236,618.89/326,531.59 = 129,188.59/x
3. Step 3: Cross multiply
   236,618.89x = 326,531.59 × 129,188.59
4. Step 4: Simplify right side
   236,618.89x = 42,184,155,702.56
5. Step 5: Solve for x
   x = 42,184,155,702.56/236,618.89
6. Step 6: Final answer
   x = 178,278.90