Finding the Fourth Proportional to 42,670.05, 64,088.12 and 34,778.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,670.05 : 64,088.12 = 34,778.40 : x
2. Step 2: Convert to fraction form
   42,670.05/64,088.12 = 34,778.40/x
3. Step 3: Cross multiply
   42,670.05x = 64,088.12 × 34,778.40
4. Step 4: Simplify right side
   42,670.05x = 2,228,882,272.61
5. Step 5: Solve for x
   x = 2,228,882,272.61/42,670.05
6. Step 6: Final answer
   x = 52,235.29