Finding the Fourth Proportional to 70,507.59, 105,708.78 and 42,421.07

Step by Step Solution

1. Step 1: Write the proportion equation
   70,507.59 : 105,708.78 = 42,421.07 : x
2. Step 2: Convert to fraction form
   70,507.59/105,708.78 = 42,421.07/x
3. Step 3: Cross multiply
   70,507.59x = 105,708.78 × 42,421.07
4. Step 4: Simplify right side
   70,507.59x = 4,484,279,027.45
5. Step 5: Solve for x
   x = 4,484,279,027.45/70,507.59
6. Step 6: Final answer
   x = 63,599.95