Finding the Fourth Proportional to 111,870.40, 154,389.36 and 64,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111,870.40 : 154,389.36 = 64,138.72 : x
2. Step 2: Convert to fraction form
   111,870.40/154,389.36 = 64,138.72/x
3. Step 3: Cross multiply
   111,870.40x = 154,389.36 × 64,138.72
4. Step 4: Simplify right side
   111,870.40x = 9,902,335,932.02
5. Step 5: Solve for x
   x = 9,902,335,932.02/111,870.40
6. Step 6: Final answer
   x = 88,516.14