Finding the Fourth Proportional to 70,807.61, 97,705.90 and 42,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   70,807.61 : 97,705.90 = 42,128.12 : x
2. Step 2: Convert to fraction form
   70,807.61/97,705.90 = 42,128.12/x
3. Step 3: Cross multiply
   70,807.61x = 97,705.90 × 42,128.12
4. Step 4: Simplify right side
   70,807.61x = 4,116,165,879.91
5. Step 5: Solve for x
   x = 4,116,165,879.91/70,807.61
6. Step 6: Final answer
   x = 58,131.69