Finding the Fourth Proportional to 290,092.39, 435,141.59 and 87,690.18

Step by Step Solution

1. Step 1: Write the proportion equation
   290,092.39 : 435,141.59 = 87,690.18 : x
2. Step 2: Convert to fraction form
   290,092.39/435,141.59 = 87,690.18/x
3. Step 3: Cross multiply
   290,092.39x = 435,141.59 × 87,690.18
4. Step 4: Simplify right side
   290,092.39x = 38,157,644,352.59
5. Step 5: Solve for x
   x = 38,157,644,352.59/290,092.39
6. Step 6: Final answer
   x = 131,536.18