Finding the Fourth Proportional to 70,575, 105,846.66 and 20,642.10

Step by Step Solution

1. Step 1: Write the proportion equation
   70,575 : 105,846.66 = 20,642.10 : x
2. Step 2: Convert to fraction form
   70,575/105,846.66 = 20,642.10/x
3. Step 3: Cross multiply
   70,575x = 105,846.66 × 20,642.10
4. Step 4: Simplify right side
   70,575x = 2,184,897,340.39
5. Step 5: Solve for x
   x = 2,184,897,340.39/70,575
6. Step 6: Final answer
   x = 30,958.52