Finding the Fourth Proportional to 42,699.30, 64,021.40 and 17,756.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,699.30 : 64,021.40 = 17,756.56 : x
2. Step 2: Convert to fraction form
   42,699.30/64,021.40 = 17,756.56/x
3. Step 3: Cross multiply
   42,699.30x = 64,021.40 × 17,756.56
4. Step 4: Simplify right side
   42,699.30x = 1,136,799,830.38
5. Step 5: Solve for x
   x = 1,136,799,830.38/42,699.30
6. Step 6: Final answer
   x = 26,623.38