Finding the Fourth Proportional to 111,467.91, 153,815.54 and 66,138.09

Step by Step Solution

1. Step 1: Write the proportion equation
   111,467.91 : 153,815.54 = 66,138.09 : x
2. Step 2: Convert to fraction form
   111,467.91/153,815.54 = 66,138.09/x
3. Step 3: Cross multiply
   111,467.91x = 153,815.54 × 66,138.09
4. Step 4: Simplify right side
   111,467.91x = 10,173,065,697.23
5. Step 5: Solve for x
   x = 10,173,065,697.23/111,467.91
6. Step 6: Final answer
   x = 91,264.52