Finding the Fourth Proportional to 139,969,160.55, 209,953,740.83 and 85,549,602.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,969,160.55 : 209,953,740.83 = 85,549,602.15 : x
2. Step 2: Convert to fraction form
   139,969,160.55/209,953,740.83 = 85,549,602.15/x
3. Step 3: Cross multiply
   139,969,160.55x = 209,953,740.83 × 85,549,602.15
4. Step 4: Simplify right side
   139,969,160.55x = 17,961,458,997,482,964
5. Step 5: Solve for x
   x = 17,961,458,997,482,964/139,969,160.55
6. Step 6: Final answer
   x = 128,324,403.23