Finding the Fourth Proportional to 42,801.40, 64,522.87 and 39,946.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.40 : 64,522.87 = 39,946.96 : x
2. Step 2: Convert to fraction form
   42,801.40/64,522.87 = 39,946.96/x
3. Step 3: Cross multiply
   42,801.40x = 64,522.87 × 39,946.96
4. Step 4: Simplify right side
   42,801.40x = 2,577,492,506.98
5. Step 5: Solve for x
   x = 2,577,492,506.98/42,801.40
6. Step 6: Final answer
   x = 60,219.82