Finding the Fourth Proportional to 128,891,168.37, 177,884,958.20 and 72,385,200.59

Step by Step Solution

1. Step 1: Write the proportion equation
   128,891,168.37 : 177,884,958.20 = 72,385,200.59 : x
2. Step 2: Convert to fraction form
   128,891,168.37/177,884,958.20 = 72,385,200.59/x
3. Step 3: Cross multiply
   128,891,168.37x = 177,884,958.20 × 72,385,200.59
4. Step 4: Simplify right side
   128,891,168.37x = 12,876,238,379,999,412
5. Step 5: Solve for x
   x = 12,876,238,379,999,412/128,891,168.37
6. Step 6: Final answer
   x = 99,900,082.70