Finding the Fourth Proportional to 259,561.50, 357,870.33 and 216,602.88

Step by Step Solution

1. Step 1: Write the proportion equation
   259,561.50 : 357,870.33 = 216,602.88 : x
2. Step 2: Convert to fraction form
   259,561.50/357,870.33 = 216,602.88/x
3. Step 3: Cross multiply
   259,561.50x = 357,870.33 × 216,602.88
4. Step 4: Simplify right side
   259,561.50x = 77,515,744,144.55
5. Step 5: Solve for x
   x = 77,515,744,144.55/259,561.50
6. Step 6: Final answer
   x = 298,641.15