Finding the Fourth Proportional to 112,207, 154,834.59 and 78,288.40

Step by Step Solution

1. Step 1: Write the proportion equation
   112,207 : 154,834.59 = 78,288.40 : x
2. Step 2: Convert to fraction form
   112,207/154,834.59 = 78,288.40/x
3. Step 3: Cross multiply
   112,207x = 154,834.59 × 78,288.40
4. Step 4: Simplify right side
   112,207x = 12,121,752,315.76
5. Step 5: Solve for x
   x = 12,121,752,315.76/112,207
6. Step 6: Final answer
   x = 108,030.27