Finding the Fourth Proportional to 28,555.98, 42,829.29 and 7,781.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,555.98 : 42,829.29 = 7,781.10 : x
2. Step 2: Convert to fraction form
   28,555.98/42,829.29 = 7,781.10/x
3. Step 3: Cross multiply
   28,555.98x = 42,829.29 × 7,781.10
4. Step 4: Simplify right side
   28,555.98x = 333,258,988.42
5. Step 5: Solve for x
   x = 333,258,988.42/28,555.98
6. Step 6: Final answer
   x = 11,670.37