Finding the Fourth Proportional to 70,980.84, 106,470.72 and 21,056.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,980.84 : 106,470.72 = 21,056.78 : x
2. Step 2: Convert to fraction form
   70,980.84/106,470.72 = 21,056.78/x
3. Step 3: Cross multiply
   70,980.84x = 106,470.72 × 21,056.78
4. Step 4: Simplify right side
   70,980.84x = 2,241,930,527.48
5. Step 5: Solve for x
   x = 2,241,930,527.48/70,980.84
6. Step 6: Final answer
   x = 31,585.01