Finding the Fourth Proportional to 311,111.25, 429,357.15 and 188,639.25

Step by Step Solution

1. Step 1: Write the proportion equation
   311,111.25 : 429,357.15 = 188,639.25 : x
2. Step 2: Convert to fraction form
   311,111.25/429,357.15 = 188,639.25/x
3. Step 3: Cross multiply
   311,111.25x = 429,357.15 × 188,639.25
4. Step 4: Simplify right side
   311,111.25x = 80,993,610,758.14
5. Step 5: Solve for x
   x = 80,993,610,758.14/311,111.25
6. Step 6: Final answer
   x = 260,336.49