Finding the Fourth Proportional to 70,419.30, 105,638.12 and 37,140.58

Step by Step Solution

1. Step 1: Write the proportion equation
   70,419.30 : 105,638.12 = 37,140.58 : x
2. Step 2: Convert to fraction form
   70,419.30/105,638.12 = 37,140.58/x
3. Step 3: Cross multiply
   70,419.30x = 105,638.12 × 37,140.58
4. Step 4: Simplify right side
   70,419.30x = 3,923,461,046.91
5. Step 5: Solve for x
   x = 3,923,461,046.91/70,419.30
6. Step 6: Final answer
   x = 55,715.71