Finding the Fourth Proportional to 70,506.59, 105,707.28 and 42,420.07

Step by Step Solution

1. Step 1: Write the proportion equation
   70,506.59 : 105,707.28 = 42,420.07 : x
2. Step 2: Convert to fraction form
   70,506.59/105,707.28 = 42,420.07/x
3. Step 3: Cross multiply
   70,506.59x = 105,707.28 × 42,420.07
4. Step 4: Simplify right side
   70,506.59x = 4,484,109,688.57
5. Step 5: Solve for x
   x = 4,484,109,688.57/70,506.59
6. Step 6: Final answer
   x = 63,598.45