Finding the Fourth Proportional to 210,978.62, 291,150.82 and 115,491.36

Step by Step Solution

1. Step 1: Write the proportion equation
   210,978.62 : 291,150.82 = 115,491.36 : x
2. Step 2: Convert to fraction form
   210,978.62/291,150.82 = 115,491.36/x
3. Step 3: Cross multiply
   210,978.62x = 291,150.82 × 115,491.36
4. Step 4: Simplify right side
   210,978.62x = 33,625,404,166.92
5. Step 5: Solve for x
   x = 33,625,404,166.92/210,978.62
6. Step 6: Final answer
   x = 159,378.25