Finding the Fourth Proportional to 121,619,152.80, 182,174,367.60 and 56,978,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   121,619,152.80 : 182,174,367.60 = 56,978,128.80 : x
2. Step 2: Convert to fraction form
   121,619,152.80/182,174,367.60 = 56,978,128.80/x
3. Step 3: Cross multiply
   121,619,152.80x = 182,174,367.60 × 56,978,128.80
4. Step 4: Simplify right side
   121,619,152.80x = 10,379,954,581,171,346
5. Step 5: Solve for x
   x = 10,379,954,581,171,346/121,619,152.80
6. Step 6: Final answer
   x = 85,348,025.72