Finding the Fourth Proportional to 103,698.56, 155,562.96 and 51,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   103,698.56 : 155,562.96 = 51,111.20 : x
2. Step 2: Convert to fraction form
   103,698.56/155,562.96 = 51,111.20/x
3. Step 3: Cross multiply
   103,698.56x = 155,562.96 × 51,111.20
4. Step 4: Simplify right side
   103,698.56x = 7,951,009,561.15
5. Step 5: Solve for x
   x = 7,951,009,561.15/103,698.56
6. Step 6: Final answer
   x = 76,674.25