Finding the Fourth Proportional to 60,705.42, 91,070.42 and 21,290.28

Step by Step Solution

1. Step 1: Write the proportion equation
   60,705.42 : 91,070.42 = 21,290.28 : x
2. Step 2: Convert to fraction form
   60,705.42/91,070.42 = 21,290.28/x
3. Step 3: Cross multiply
   60,705.42x = 91,070.42 × 21,290.28
4. Step 4: Simplify right side
   60,705.42x = 1,938,914,635.07
5. Step 5: Solve for x
   x = 1,938,914,635.07/60,705.42
6. Step 6: Final answer
   x = 31,939.73