Finding the Fourth Proportional to 112,343.91, 154,770.89 and 78,290.49

Step by Step Solution

1. Step 1: Write the proportion equation
   112,343.91 : 154,770.89 = 78,290.49 : x
2. Step 2: Convert to fraction form
   112,343.91/154,770.89 = 78,290.49/x
3. Step 3: Cross multiply
   112,343.91x = 154,770.89 × 78,290.49
4. Step 4: Simplify right side
   112,343.91x = 12,117,088,424.38
5. Step 5: Solve for x
   x = 12,117,088,424.38/112,343.91
6. Step 6: Final answer
   x = 107,857.10