Finding the Fourth Proportional to 42,661.10, 63,970.58 and 13,071.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,661.10 : 63,970.58 = 13,071.80 : x
2. Step 2: Convert to fraction form
   42,661.10/63,970.58 = 13,071.80/x
3. Step 3: Cross multiply
   42,661.10x = 63,970.58 × 13,071.80
4. Step 4: Simplify right side
   42,661.10x = 836,210,820.25
5. Step 5: Solve for x
   x = 836,210,820.25/42,661.10
6. Step 6: Final answer
   x = 19,601.25