Finding the Fourth Proportional to 78,886.50, 108,780.40 and 51,994.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,886.50 : 108,780.40 = 51,994.56 : x
2. Step 2: Convert to fraction form
   78,886.50/108,780.40 = 51,994.56/x
3. Step 3: Cross multiply
   78,886.50x = 108,780.40 × 51,994.56
4. Step 4: Simplify right side
   78,886.50x = 5,655,989,034.62
5. Step 5: Solve for x
   x = 5,655,989,034.62/78,886.50
6. Step 6: Final answer
   x = 71,697.81