Finding the Fourth Proportional to 71,002.56, 106,485.57 and 21,070.83

Step by Step Solution

1. Step 1: Write the proportion equation
   71,002.56 : 106,485.57 = 21,070.83 : x
2. Step 2: Convert to fraction form
   71,002.56/106,485.57 = 21,070.83/x
3. Step 3: Cross multiply
   71,002.56x = 106,485.57 × 21,070.83
4. Step 4: Simplify right side
   71,002.56x = 2,243,739,342.92
5. Step 5: Solve for x
   x = 2,243,739,342.92/71,002.56
6. Step 6: Final answer
   x = 31,600.82