Finding the Fourth Proportional to 42,990.54, 64,488.99 and 18,005.46

Step by Step Solution

1. Step 1: Write the proportion equation
   42,990.54 : 64,488.99 = 18,005.46 : x
2. Step 2: Convert to fraction form
   42,990.54/64,488.99 = 18,005.46/x
3. Step 3: Cross multiply
   42,990.54x = 64,488.99 × 18,005.46
4. Step 4: Simplify right side
   42,990.54x = 1,161,153,929.89
5. Step 5: Solve for x
   x = 1,161,153,929.89/42,990.54
6. Step 6: Final answer
   x = 27,009.52