Finding the Fourth Proportional to 70,638.32, 105,858.96 and 53,087.60

Step by Step Solution

1. Step 1: Write the proportion equation
   70,638.32 : 105,858.96 = 53,087.60 : x
2. Step 2: Convert to fraction form
   70,638.32/105,858.96 = 53,087.60/x
3. Step 3: Cross multiply
   70,638.32x = 105,858.96 × 53,087.60
4. Step 4: Simplify right side
   70,638.32x = 5,619,798,124.90
5. Step 5: Solve for x
   x = 5,619,798,124.90/70,638.32
6. Step 6: Final answer
   x = 79,557.36