Finding the Fourth Proportional to 42,916.50, 64,389.87 and 19,222.11

Step by Step Solution

1. Step 1: Write the proportion equation
   42,916.50 : 64,389.87 = 19,222.11 : x
2. Step 2: Convert to fraction form
   42,916.50/64,389.87 = 19,222.11/x
3. Step 3: Cross multiply
   42,916.50x = 64,389.87 × 19,222.11
4. Step 4: Simplify right side
   42,916.50x = 1,237,709,164.03
5. Step 5: Solve for x
   x = 1,237,709,164.03/42,916.50
6. Step 6: Final answer
   x = 28,839.94