Finding the Fourth Proportional to 42,779.48, 64,181.50 and 21,718.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,779.48 : 64,181.50 = 21,718.67 : x
2. Step 2: Convert to fraction form
   42,779.48/64,181.50 = 21,718.67/x
3. Step 3: Cross multiply
   42,779.48x = 64,181.50 × 21,718.67
4. Step 4: Simplify right side
   42,779.48x = 1,393,936,443.40
5. Step 5: Solve for x
   x = 1,393,936,443.40/42,779.48
6. Step 6: Final answer
   x = 32,584.23