Finding the Fourth Proportional to 70,028.35, 105,026.52 and 20,108.05

Step by Step Solution

1. Step 1: Write the proportion equation
   70,028.35 : 105,026.52 = 20,108.05 : x
2. Step 2: Convert to fraction form
   70,028.35/105,026.52 = 20,108.05/x
3. Step 3: Cross multiply
   70,028.35x = 105,026.52 × 20,108.05
4. Step 4: Simplify right side
   70,028.35x = 2,111,878,328.32
5. Step 5: Solve for x
   x = 2,111,878,328.32/70,028.35
6. Step 6: Final answer
   x = 30,157.48