Finding the Fourth Proportional to 42,670.38, 64,003.16 and 13,088.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,670.38 : 64,003.16 = 13,088.14 : x
2. Step 2: Convert to fraction form
   42,670.38/64,003.16 = 13,088.14/x
3. Step 3: Cross multiply
   42,670.38x = 64,003.16 × 13,088.14
4. Step 4: Simplify right side
   42,670.38x = 837,682,318.52
5. Step 5: Solve for x
   x = 837,682,318.52/42,670.38
6. Step 6: Final answer
   x = 19,631.47