Finding the Fourth Proportional to 90,978.05, 136,530.39 and 37,670.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90,978.05 : 136,530.39 = 37,670.30 : x
2. Step 2: Convert to fraction form
   90,978.05/136,530.39 = 37,670.30/x
3. Step 3: Cross multiply
   90,978.05x = 136,530.39 × 37,670.30
4. Step 4: Simplify right side
   90,978.05x = 5,143,140,721.02
5. Step 5: Solve for x
   x = 5,143,140,721.02/90,978.05
6. Step 6: Final answer
   x = 56,531.66