Finding the Fourth Proportional to 76,969.96, 115,459.42 and 21,570.28

Step by Step Solution

1. Step 1: Write the proportion equation
   76,969.96 : 115,459.42 = 21,570.28 : x
2. Step 2: Convert to fraction form
   76,969.96/115,459.42 = 21,570.28/x
3. Step 3: Cross multiply
   76,969.96x = 115,459.42 × 21,570.28
4. Step 4: Simplify right side
   76,969.96x = 2,490,492,018.04
5. Step 5: Solve for x
   x = 2,490,492,018.04/76,969.96
6. Step 6: Final answer
   x = 32,356.68