Finding the Fourth Proportional to 42,870.25, 64,309.83 and 11,705.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.25 : 64,309.83 = 11,705.50 : x
2. Step 2: Convert to fraction form
   42,870.25/64,309.83 = 11,705.50/x
3. Step 3: Cross multiply
   42,870.25x = 64,309.83 × 11,705.50
4. Step 4: Simplify right side
   42,870.25x = 752,778,715.07
5. Step 5: Solve for x
   x = 752,778,715.07/42,870.25
6. Step 6: Final answer
   x = 17,559.47