Finding the Fourth Proportional to 51,056.78, 70,457.73 and 28,700.78

Step by Step Solution

1. Step 1: Write the proportion equation
   51,056.78 : 70,457.73 = 28,700.78 : x
2. Step 2: Convert to fraction form
   51,056.78/70,457.73 = 28,700.78/x
3. Step 3: Cross multiply
   51,056.78x = 70,457.73 × 28,700.78
4. Step 4: Simplify right side
   51,056.78x = 2,022,191,808.03
5. Step 5: Solve for x
   x = 2,022,191,808.03/51,056.78
6. Step 6: Final answer
   x = 39,606.72