Finding the Fourth Proportional to 103,769.60, 155,652.80 and 70,406.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103,769.60 : 155,652.80 = 70,406.72 : x
2. Step 2: Convert to fraction form
   103,769.60/155,652.80 = 70,406.72/x
3. Step 3: Cross multiply
   103,769.60x = 155,652.80 × 70,406.72
4. Step 4: Simplify right side
   103,769.60x = 10,959,003,106.82
5. Step 5: Solve for x
   x = 10,959,003,106.82/103,769.60
6. Step 6: Final answer
   x = 105,608.99