Finding the Fourth Proportional to 212,373,454.17, 293,090,096.52 and 128,745,109.71

Step by Step Solution

1. Step 1: Write the proportion equation
   212,373,454.17 : 293,090,096.52 = 128,745,109.71 : x
2. Step 2: Convert to fraction form
   212,373,454.17/293,090,096.52 = 128,745,109.71/x
3. Step 3: Cross multiply
   212,373,454.17x = 293,090,096.52 × 128,745,109.71
4. Step 4: Simplify right side
   212,373,454.17x = 37,733,916,631,381,888
5. Step 5: Solve for x
   x = 37,733,916,631,381,888/212,373,454.17
6. Step 6: Final answer
   x = 177,677,180.88