Finding the Fourth Proportional to 42,670.88, 64,003.91 and 13,088.63

Step by Step Solution

1. Step 1: Write the proportion equation
   42,670.88 : 64,003.91 = 13,088.63 : x
2. Step 2: Convert to fraction form
   42,670.88/64,003.91 = 13,088.63/x
3. Step 3: Cross multiply
   42,670.88x = 64,003.91 × 13,088.63
4. Step 4: Simplify right side
   42,670.88x = 837,723,496.54
5. Step 5: Solve for x
   x = 837,723,496.54/42,670.88
6. Step 6: Final answer
   x = 19,632.21