Finding the Fourth Proportional to 65,639, 97,946.30 and 58,570.40

Step by Step Solution

1. Step 1: Write the proportion equation
   65,639 : 97,946.30 = 58,570.40 : x
2. Step 2: Convert to fraction form
   65,639/97,946.30 = 58,570.40/x
3. Step 3: Cross multiply
   65,639x = 97,946.30 × 58,570.40
4. Step 4: Simplify right side
   65,639x = 5,736,753,969.52
5. Step 5: Solve for x
   x = 5,736,753,969.52/65,639
6. Step 6: Final answer
   x = 87,398.56