Finding the Fourth Proportional to 70,275, 105,246.84 and 60,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,275 : 105,246.84 = 60,990.72 : x
2. Step 2: Convert to fraction form
   70,275/105,246.84 = 60,990.72/x
3. Step 3: Cross multiply
   70,275x = 105,246.84 × 60,990.72
4. Step 4: Simplify right side
   70,275x = 6,419,080,549.32
5. Step 5: Solve for x
   x = 6,419,080,549.32/70,275
6. Step 6: Final answer
   x = 91,342.31