Finding the Fourth Proportional to 42,870.76, 64,307.94 and 11,705.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.76 : 64,307.94 = 11,705.92 : x
2. Step 2: Convert to fraction form
   42,870.76/64,307.94 = 11,705.92/x
3. Step 3: Cross multiply
   42,870.76x = 64,307.94 × 11,705.92
4. Step 4: Simplify right side
   42,870.76x = 752,783,601.00
5. Step 5: Solve for x
   x = 752,783,601.00/42,870.76
6. Step 6: Final answer
   x = 17,559.37