Finding the Fourth Proportional to 210,978.32, 291,150.52 and 115,491.12

Step by Step Solution

1. Step 1: Write the proportion equation
   210,978.32 : 291,150.52 = 115,491.12 : x
2. Step 2: Convert to fraction form
   210,978.32/291,150.52 = 115,491.12/x
3. Step 3: Cross multiply
   210,978.32x = 291,150.52 × 115,491.12
4. Step 4: Simplify right side
   210,978.32x = 33,625,299,643.38
5. Step 5: Solve for x
   x = 33,625,299,643.38/210,978.32
6. Step 6: Final answer
   x = 159,377.99