Finding the Fourth Proportional to 42,693.99, 64,039.61 and 19,320.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,693.99 : 64,039.61 = 19,320.42 : x
2. Step 2: Convert to fraction form
   42,693.99/64,039.61 = 19,320.42/x
3. Step 3: Cross multiply
   42,693.99x = 64,039.61 × 19,320.42
4. Step 4: Simplify right side
   42,693.99x = 1,237,272,450.29
5. Step 5: Solve for x
   x = 1,237,272,450.29/42,693.99
6. Step 6: Final answer
   x = 28,980.02