Finding the Fourth Proportional to 201,978.72, 278,730.56 and 111,336.19

Step by Step Solution

1. Step 1: Write the proportion equation
   201,978.72 : 278,730.56 = 111,336.19 : x
2. Step 2: Convert to fraction form
   201,978.72/278,730.56 = 111,336.19/x
3. Step 3: Cross multiply
   201,978.72x = 278,730.56 × 111,336.19
4. Step 4: Simplify right side
   201,978.72x = 31,032,798,064.83
5. Step 5: Solve for x
   x = 31,032,798,064.83/201,978.72
6. Step 6: Final answer
   x = 153,643.90