Finding the Fourth Proportional to 111,858.18, 154,367.91 and 64,120.56

Step by Step Solution

1. Step 1: Write the proportion equation
   111,858.18 : 154,367.91 = 64,120.56 : x
2. Step 2: Convert to fraction form
   111,858.18/154,367.91 = 64,120.56/x
3. Step 3: Cross multiply
   111,858.18x = 154,367.91 × 64,120.56
4. Step 4: Simplify right side
   111,858.18x = 9,898,156,835.23
5. Step 5: Solve for x
   x = 9,898,156,835.23/111,858.18
6. Step 6: Final answer
   x = 88,488.45